Get a filtered list of RPC endpoints for a given chain ID
AI agents call get_filtered_rpc_list to retrieve information from Etherscan MCP Tool without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves RPC endpoint information based on filtering criteria (chain ID), which is a read-only query operation. It has no side effects, does not execute code, does not modify data, and does not create financial obligations. The blast radius of misuse is minimal—obtaining a list of public RPC endpoints poses negligible risk compared to other blockchain interaction tools.
From the tool's definition Tool description states 'Get a filtered list of RPC endpoints for a given chain ID' — this is a retrieval operation that queries and returns blockchain network endpoint data without modification or execution.
Attacks that exploit this kind of access
Get a filtered list of RPC endpoints for a given chain ID. It is categorised as a Read tool in the Etherscan MCP Tool MCP Server, which means it retrieves data without modifying state.
Register the Etherscan MCP Tool MCP server in PolicyLayer and add a rule for get_filtered_rpc_list: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Etherscan MCP Tool. Nothing to install.
get_filtered_rpc_list is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_filtered_rpc_list rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for get_filtered_rpc_list. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
get_filtered_rpc_list is provided by the Etherscan MCP Tool MCP server (septemhill/etherscan-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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